WO2021000954A1 - 一种数据传输方法及通信装置 - Google Patents

一种数据传输方法及通信装置 Download PDF

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Publication number
WO2021000954A1
WO2021000954A1 PCT/CN2020/100239 CN2020100239W WO2021000954A1 WO 2021000954 A1 WO2021000954 A1 WO 2021000954A1 CN 2020100239 W CN2020100239 W CN 2020100239W WO 2021000954 A1 WO2021000954 A1 WO 2021000954A1
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Prior art keywords
time
data
frequency
interval
frequency domain
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PCT/CN2020/100239
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English (en)
French (fr)
Chinese (zh)
Inventor
董蕾
张锦芳
卢磊
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华为技术有限公司
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Priority to EP20834133.9A priority Critical patent/EP3958597A4/de
Publication of WO2021000954A1 publication Critical patent/WO2021000954A1/zh
Priority to US17/532,352 priority patent/US20220086804A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/46—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for vehicle-to-vehicle communication [V2V]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Definitions

  • This application relates to the field of communication technology, and in particular to a data transmission method and communication device.
  • V2X Vehicle-to-everything
  • V2X technology is a new generation of information and communication technology that can connect vehicles with everything.
  • V2X technology includes vehicle-to-vehicle (V2V) , Vehicle-to-pedestrian (V2P), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), etc.
  • V2X technology for a transmission block (TB), only two transmissions are supported at most, that is, one initial transmission and one retransmission, and the frequency domain resources used for the initial transmission and retransmission are the same.
  • V2X technology needs to support more data transmission times and higher reliability.
  • the existing scheme that supports at most two transmissions cannot meet the reliability requirements, and the frequency domain resources used in the initial transmission and retransmission are the same, and the frequency diversity gain is not fully utilized.
  • the embodiments of the present application provide a data transmission method and a communication device, which are used to provide a data transmission scheme that supports multiple retransmissions and frequency hopping of data, and improves the reliability of data transmission.
  • an embodiment of the present application provides a data transmission method that can be applied to a first terminal device.
  • the method includes: the first terminal device obtains the number of transmissions n and interval indication information, where the interval indication information is used to indicate time Domain interval, frequency domain interval, or time domain interval and frequency domain interval, the time domain interval is used to indicate the distance between the time domain resource for the i-th transmission of the first data and the time domain resource for the i-1th transmission of the first data Time domain interval, frequency domain interval is used to indicate the frequency domain interval between the frequency domain resource for the i-th transmission of the first data and the frequency domain resource for the i-1th transmission of the first data, where 1 ⁇ i ⁇ n, n is a positive integer greater than or equal to 2; the first terminal device sends sideline control information to the second terminal device, and the sideline control information is used to indicate the number of transmissions n, interval indication information, and i; the first terminal device according to the number of transmissions n And interval indication information to determine the first time-frequency resource used
  • the first terminal device can determine the i-th transmission of the first data according to the number of transmissions n and the time domain interval, frequency domain interval, or time domain interval and frequency domain interval indicated in the interval indication information. Time-frequency resources used at the time. In this way, in different transmission processes of the first data, the first terminal device can use different time-frequency resources to transmit the first data, so that the time and frequency diversity gain can be fully utilized, and the reliability of data transmission can be effectively improved.
  • the number of transmissions n in the embodiment of the present application is greater than or equal to 2, which can support multiple retransmissions of the first data, and even if the number of transmissions is 2, when the first data is only retransmitted once, the retransmission can be used with the original Time-frequency resources with different transmission time.
  • the first terminal device acquiring the number of transmissions n and the interval indication information may be that the first terminal device receives the first indication information from the network device, and the first indication information is used to indicate the number of transmissions n and the interval indication. Information, the number of transmissions n and the interval indication information are determined according to the first indication information; or, the first terminal device obtains the number of transmissions n and the interval indication information, which may also be the quality of service QoS corresponding to the first data of the first terminal device, Determine the number of transmissions n and interval indication information.
  • the first terminal device can obtain the number of transmissions n of the first data and the interval indication information from the network device, and can also determine the number of transmissions n and the interval of the first data according to the QoS requirements of its own service. Instruction information, which has better flexibility.
  • the first terminal device determining the first time-frequency resource used for the i-th sending of the first data may be: the first terminal device determining the time-domain start position of the i-th sending of the first data, the The starting position of the time domain satisfies:
  • the first terminal device determines the first time-frequency resource according to the time domain starting position of the i-th sending of the first data.
  • the time domain resources used in different transmission processes of the first data can be different, and can be changed regularly according to the time domain interval indicated in the interval indication information, thereby making full use of time diversity Gain, improve the reliability of data transmission.
  • the first terminal device determining the first time-frequency resource used for the i-th sending of the first data may also be: the first terminal device determining the frequency domain start of the i-th sending of the first data Position, the starting position of the frequency domain satisfies:
  • m is the start position of the frequency domain when the first data is sent for the first time
  • SF frequency-gap is the frequency domain interval
  • N subCH is the width of the frequency domain resource pool
  • the frequency domain resources used in different transmission processes of the first data, can be different, and can be changed regularly according to the frequency domain interval indicated in the interval indication information, thereby making full use of frequency diversity Gain, improve the reliability of data transmission.
  • the frequency domain interval and the time domain interval can satisfy the following relationship:
  • K is an integer greater than or equal to 1.
  • the time domain interval may be indicated only in the interval indication information, and the frequency domain interval can be derived according to the association relationship, In this way, the purpose of indirectly indicating the frequency domain interval in the interval indication information is achieved.
  • the first terminal device determining the first time-frequency resource used for the i-th transmission of the first data may also be: the first terminal device determining the frequency domain start position of the i-th transmission of the first data, The starting position of the frequency domain satisfies:
  • m is the frequency domain starting position when the first data is sent for the first time
  • N subCH is the width of the frequency domain resource pool
  • L subCH is the frequency domain width occupied by the first data
  • the first terminal device is based on the i-th time The frequency domain starting position when the first data is sent, and the first time domain resource is determined.
  • the frequency domain resources used in different transmission processes of the first data can be different, and the frequency resources used for each data transmission can be regularly changed by the configuration parameters of the relevant resources, so that it can fully Use frequency diversity gain to improve the reliability of data transmission.
  • embodiments of the present application provide a data transmission method, which can be applied to a second terminal device, and the method includes: the second terminal device receives side-line control information from the first terminal device, and the side-line control information is used for To indicate the number of transmissions n, interval indication information, and i, i is used to indicate that the first data is the i-th transmission, and the interval indication information is used to indicate the time domain interval, frequency domain interval, or time domain interval and frequency domain interval.
  • the interval is used to indicate the time domain interval between the time domain resource for sending the first data for the ith time and the time domain resource for sending the first data for the i-1th time
  • the frequency domain interval is used to indicate the time domain for sending the first data for the ith time.
  • the frequency domain interval between the frequency domain resource and the frequency domain resource for sending the first data for the i-1th time where 1 ⁇ i ⁇ n, and n is a positive integer greater than or equal to 2; the second terminal device according to the number of transmissions n and The interval indication information determines the first time-frequency resource used for receiving the first data for the i-th time; the second terminal device receives the first data sent by the first terminal device on the first time-frequency resource.
  • the second terminal device receives the side-line control information sent by the first terminal device, and can be based on the number of transmissions n indicated in the side-line control information and the time domain interval and frequency indicated in the interval indication information.
  • the domain interval or the time domain interval and the frequency domain interval determine the time-frequency resource used for the i-th transmission of the first data.
  • the second terminal device can use different time-frequency resources to receive the first data, so that the time and frequency diversity gain can be fully utilized, and the reliability of data transmission can be effectively improved.
  • the number of transmissions n in the embodiment of the present application is greater than or equal to 3, which can support multiple retransmissions of the first data, and even if the number of transmissions is 2, when the first data is retransmitted only once, the retransmission can be used with the original Time-frequency resources with different transmission time.
  • the second terminal device determining the first time-frequency resource used for the i-th reception of the first data may be: the second terminal device determining the time-domain start position of the i-th reception of the first data, and The starting position of the time domain satisfies:
  • the second terminal device determines the first time-frequency resource according to the time-domain starting position of the i-th reception of the first data.
  • the time domain resources used in different transmission processes of the first data can be different, and can be changed regularly according to the time domain interval indicated in the interval indication information, thereby making full use of time diversity Gain, improve the reliability of data transmission.
  • the second terminal device determining the first time-frequency resource used for the i-th reception of the first data may also determine the frequency domain starting position for the i-th reception of the first data for the second terminal device.
  • the starting position of the frequency domain satisfies:
  • m is the start position in the frequency domain when the first terminal device transmits the first data for the first time
  • SF frequency-gap is the frequency domain interval
  • N subCH is the width of the frequency domain resource pool
  • the frequency domain resources used in different transmission processes of the first data, can be different, and can be changed regularly according to the frequency domain interval indicated in the interval indication information, thereby making full use of frequency diversity Gain, improve the reliability of data transmission.
  • the frequency domain interval and the time domain interval can satisfy the following relationship:
  • K is an integer greater than or equal to 1.
  • the time domain interval may be indicated only in the interval indication information, and the frequency domain interval can be derived according to the association relationship, In this way, the purpose of indirectly indicating the frequency domain interval in the interval indication information is achieved.
  • the second terminal device determines the first time-frequency resource used for the i-th reception of the first data, which may also be: the first terminal device determines the frequency-domain starting position for the i-th reception of the first data , The starting position of the frequency domain satisfies:
  • N subCH is the width of the frequency domain resource pool
  • L subCH is the frequency domain width occupied by the first data
  • the frequency domain resources used in different transmission processes of the first data can be different, and the frequency resources used for each data transmission can be regularly changed by the configuration parameters of the relevant resources, so that it can fully Use frequency diversity gain to improve the reliability of data transmission.
  • an embodiment of the present application provides a communication device that has the function of a first terminal device in any possible design of the first aspect or the first aspect, or has the second aspect or The function of the second terminal device in any possible design of the second aspect.
  • the communication device may be a terminal device, such as a handheld terminal device, a vehicle-mounted terminal device, etc., or a device included in the terminal device, such as a chip, or a device including a terminal device.
  • the functions of the above-mentioned terminal device may be realized by hardware, or may be realized by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the structure of the communication device includes a processing module and a transceiver module, wherein the processing module is configured to support the communication device to perform the corresponding function in the first aspect or any one of the first aspects. , Or perform the corresponding function in the second aspect or any one of the second aspects mentioned above.
  • the transceiver module is used to support the communication between the communication device and other communication devices. For example, when the communication device is the first terminal device, it can send side-line control information to the second terminal device and send the second terminal device on the first time-frequency resource. The terminal device sends the first data.
  • the communication device may also include a storage module, which is coupled with the processing module, which stores program instructions and data necessary for the communication device.
  • the processing module may be a processor
  • the communication module may be a transceiver
  • the storage module may be a memory.
  • the memory may be integrated with the processor or may be provided separately from the processor, which is not limited in this application.
  • the structure of the communication device includes a processor and may also include a memory.
  • the processor is coupled with the memory, and can be used to execute the computer program instructions stored in the memory, so that the communication device executes the method in any possible design of the first aspect or the first aspect, or executes the second aspect or the second aspect. Any one of the possible design methods.
  • the communication device further includes a communication interface, and the processor is coupled with the communication interface.
  • the communication interface may be a transceiver or an input/output interface; when the communication device is a chip included in the terminal device, the communication interface may be an input/output interface of the chip.
  • the transceiver may be a transceiver circuit, and the input/output interface may be an input/output circuit.
  • an embodiment of the present application provides a chip system, including: a processor, the processor is coupled with a memory, the memory is used to store a program or an instruction, when the program or an instruction is executed by the processor , So that the chip system implements any possible design method of the foregoing first aspect, or implements any possible design method of the foregoing second aspect.
  • processors in the chip system there may be one or more processors in the chip system.
  • the processor can be implemented by hardware or software.
  • the processor may be a logic circuit, an integrated circuit, or the like.
  • the processor may be a general-purpose processor, which is implemented by reading software codes stored in the memory.
  • the memory may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application.
  • the memory may be a non-transitory processor, such as a read-only memory ROM, which may be integrated with the processor on the same chip, or may be set on different chips.
  • the setting method of the processor is not specifically limited.
  • an embodiment of the present application provides a computer-readable storage medium, which stores computer-readable instructions.
  • the computer reads and executes the computer-readable instructions, the computer is caused to execute the first
  • the method in any possible design of the aspect, or the method in any possible design of the second aspect described above.
  • the embodiments of the present application provide a computer program product.
  • the computer reads and executes the computer program product, the computer executes any of the possible design methods in the first aspect, or executes the first Any of the two possible design methods.
  • an embodiment of the present application provides a communication system, which includes the first terminal device and the second terminal device described above.
  • the communication system may also include network equipment.
  • Figure 1 is a schematic diagram of the application scenario of V2X technology
  • FIG. 2 is a schematic diagram of a network architecture of a communication system to which an embodiment of this application is applicable;
  • FIG. 3 is a schematic flowchart of a data transmission method provided by an embodiment of this application.
  • Example 4 is a schematic diagram of the first time-frequency resource in Example 1 provided by an embodiment of this application;
  • Example 5 is a schematic diagram of the first time-frequency resource in Example 2 provided by an embodiment of this application.
  • 6a and 6b are schematic diagrams of the first time-frequency resource in Example 3 provided by an embodiment of this application;
  • FIG. 7 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 8 is a schematic diagram of another structure of a communication device provided by an embodiment of this application.
  • GSM global system for mobile communications
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • LTE frequency division duplex FDD
  • TDD LTE Time division duplex
  • UMTS universal mobile telecommunication system
  • WIMAX worldwide interoperability for microwave access
  • 5G fifth generation
  • NR new radio
  • the technical solutions provided by the embodiments of the present application can be applied to cellular links, and can also be applied to links between devices, such as device-to-device (D2D) links.
  • D2D link or V2X link may also be called side link, auxiliary link or side link.
  • the aforementioned terms all refer to links established between devices of the same type, and have the same meaning.
  • the so-called devices of the same type can be the link between the terminal device and the terminal device, the link between the base station and the base station, and the link between the relay node and the relay node. This application The embodiment does not limit this.
  • V2X link For the link between the terminal device and the terminal device, there are D2D links defined by 3GPP version (Rel)-12/13, and there are also car-to-car, car-to-mobile, or car-to-any entity defined by 3GPP for the Internet of Vehicles.
  • V2X link including Rel-14/15. It also includes the V2X link based on the NR system of Rel-16 and subsequent versions that are currently being studied by 3GPP.
  • FIG. 2 is a schematic diagram of a network architecture of a communication system to which an embodiment of this application is applicable.
  • the communication system includes a terminal device 210 and a terminal device 220.
  • the terminal equipment and the terminal equipment can communicate directly through the PC5 interface, and the direct communication link between the terminal equipment and the terminal equipment is the side link.
  • Communication based on the side link can use at least one of the following channels: a physical sidelink shared channel (PSSCH) for carrying data; a physical sidelink control channel (physical sidelink) control channel, PSCCH), used to carry sidelink control information (SCI).
  • PSSCH physical sidelink shared channel
  • PSCCH physical sidelink control channel
  • the communication system further includes a network device 230 for providing timing synchronization and resource scheduling for terminal devices.
  • the network device can communicate with at least one terminal device (such as the terminal device 210) through the Uu interface.
  • the communication link between the network equipment and the terminal equipment includes an uplink (UL) and a downlink (DL).
  • the terminal device and the terminal device can also realize indirect communication through network device forwarding.
  • the terminal device 210 can send data to the network device 230 through the Uu interface, and then send the data to the application server 240 through the network device 230 for processing, and then The application server 240 delivers the processed data to the network device 230 and sends it to the terminal device 220 through the network device 230.
  • the network device 230 that forwards the uplink data from the terminal device 210 to the application server 240 and the network device 230 that forwards the downlink data delivered by the application server 240 to the terminal device 220 may be the same network device, or It can be different network devices and can be determined by the application server.
  • the terminal device 210 can send some of its own information to the terminal device 220 or other surrounding terminal devices.
  • This information can include information that needs to be sent periodically, such as location, speed, and intent, as well as some non-periodic information.
  • the information sent is triggered by a sexual event.
  • the terminal device 210 can also receive information of other surrounding vehicle users in real time.
  • the network device in FIG. 2 may be an access network device, such as a base station.
  • the access network device in different systems corresponding to different devices for example, in the fourth generation mobile communication technology (the 4 th generation, 4G) system, the eNB may correspond, a corresponding access network device 5G 5G in the system, For example, gNB.
  • the terminal device 210 and the terminal device 220 are shown in FIG. 2, it should be understood that the network device can provide services for multiple terminal devices, and the embodiment of the present application does not limit the number of terminal devices in the communication system. In the same way, the terminal device in FIG.
  • Terminal equipment also known as user equipment (UE), mobile station (MS), mobile terminal (MT), etc.
  • UE user equipment
  • MS mobile station
  • MT mobile terminal
  • the terminal device may communicate with the core network via a radio access network (RAN), and exchange voice and/or data with the RAN.
  • RAN radio access network
  • the terminal device may be a handheld device with a wireless connection function, a vehicle-mounted device, a vehicle user device, and so on.
  • terminal devices are: mobile phones (mobile phones), tablets, laptops, palmtop computers, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented Augmented reality (AR) equipment, wireless terminals in industrial control (industrial control), wireless terminals in self-driving (self-driving), wireless terminals in remote medical surgery, and smart grid (smart grid)
  • the terminal device in the embodiments of the present application may also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip, or vehicle-mounted unit that is built into a vehicle as one or more components or units. Modules, on-board components, on-board chips or on-board units can implement the method of the present application.
  • Network equipment is the equipment used in the network to connect terminal equipment to the wireless network.
  • the network device may be a node in a radio access network, may also be called a base station, or may also be called a radio access network (RAN) node (or device).
  • the network device can be used to convert received air frames and Internet Protocol (IP) packets to each other, and act as a router between the terminal device and the rest of the access network, where the rest of the access network may include an IP network.
  • IP Internet Protocol
  • the network equipment can also coordinate the attribute management of the air interface.
  • the network equipment may include an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in a long term evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-A), such as
  • LTE long term evolution
  • LTE-A evolved LTE system
  • the traditional macro base station eNB and the micro base station eNB in the heterogeneous network scenario may also include the next generation node B (next generation) in the fifth generation mobile communication technology (5th generation, 5G) new radio (NR) system.
  • 5th generation, 5G fifth generation mobile communication technology
  • NR new radio
  • node B node B, gNB
  • TRP transmission reception point
  • home base station for example, home evolved NodeB, or home Node B, HNB
  • baseband unit BBU
  • baseband pool BBU pool or WiFi access point (access point, AP), etc.
  • CU centralized unit
  • CU distributed unit
  • DU cloud radio access network
  • a network device in a V2X technology is a roadside unit (RSU).
  • the RSU may be a fixed infrastructure entity that supports V2X applications, and can exchange messages with other entities that support V2X applications.
  • “Multiple” refers to two or more than two. In view of this, “multiple” can also be understood as “at least two” in the embodiments of the present application. "At least one” can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and it does not limit which ones are included. For example, if at least one of A, B, and C is included, then A, B, C, A and B, A and C, B and C, or A and B and C are included. In the same way, the understanding of "at least one" and other descriptions is similar.
  • FIG. 3 is a schematic flowchart of a data transmission method provided by an embodiment of this application.
  • the method includes the following steps S301 to S307:
  • Step S301 The first terminal device obtains the number of transmissions n and interval indication information.
  • the first terminal device mentioned in the embodiments of the present application refers to the sender of the first data
  • the second terminal device refers to the receiver of the first data.
  • the number of transmissions n is the number of transmissions of the first data
  • n is a positive integer greater than or equal to 2.
  • the embodiments of this application are applicable to the transmission mode of blind retransmission or hybrid automatic repeat request (HARQ).
  • HARQ hybrid automatic repeat request
  • the number of transmissions n indicates that the first terminal device will continuously send the first data n times, regardless of whether the second terminal device successfully received the first data during the previous transmission.
  • n greater than or equal to 2 may indicate that the first data will be transmitted at least twice, including one initial transmission and at least one retransmission.
  • the number of transmissions n represents the maximum number of transmissions of the first data, and the actual number of transmissions of the first data may be less than or equal to the maximum number of transmissions.
  • the network device or the first terminal device can pre-configure the time-frequency resource used when transmitting the first data n times, but only when the second terminal device fails to receive in the previous transmission, such as the first terminal device receives the second terminal device's transmission NACK, the first terminal device will send the first data again.
  • the interval indication information is used to indicate the time domain interval, the frequency domain interval, or the time domain interval and the frequency domain interval. It can be understood that the interval indication information may only indicate the time domain interval, or may only indicate the frequency domain interval, or may indicate both the time domain interval and the frequency domain interval, which is not limited in this application.
  • the time domain interval refers to the time domain interval between the time domain resource when the first data is sent for the i-th time and the time domain resource when the first data is sent for the i-1th time, that is, the interval between two adjacent transmissions of the first data.
  • the unit of the time domain interval can be a time unit, and each time unit can be a time slot or symbol.
  • Frequency domain interval refers to the frequency domain interval between the frequency domain resource when the first data is sent for the i-th time and the frequency domain resource when the first data is sent for the i-1th time, that is, two adjacent transmissions of the first data
  • the interval between the frequency domain resources in the frequency domain, the unit of the frequency domain interval may be a subchannel or a resource block (resource block, RB), and the number of resource blocks included in a subchannel may be one or more resource blocks, such as 2
  • the RB or 4 RBs can be specifically configured by network equipment, which is not limited in this application.
  • i is a positive integer greater than or equal to 1 and less than or equal to n, indicating that the current transmission of the first data is the number of times.
  • the first terminal device may have multiple possible implementation manners for acquiring the number of transmissions n and the interval indication information.
  • the number of transmissions n and the interval indication information may be network device configuration and sent to the first terminal device through the first indication information.
  • the first terminal device may receive the first indication information from the network device, and obtain the number of transmission n indicated by the network device and the interval indication information from the first indication information.
  • the first indication information may be physical layer configuration signaling, or medium access control (MAC) signaling, or radio resource control (RRC) control signaling, or downlink control Information (downlink control information, DCI), this application is not limited.
  • the number of transmissions n and the interval indication information may be determined by the first terminal device itself.
  • the first terminal device may determine the number of transmissions n and the interval indication information according to the quality of service (QoS) requirements corresponding to the first data.
  • QoS quality of service
  • time domain interval and frequency domain interval indicated in the interval indication information may be two fields in the first indication information.
  • the interval indication information indicates both the time domain interval and the frequency domain interval
  • the interval can be two independent fields, or two fields with an association relationship, which is not limited in this application.
  • Step S302 The first terminal device sends side-line control information to the second terminal device.
  • the side link control information may be side link control information (sidelink control information, SCI).
  • SCI sidelink control information
  • the SCI is used to indicate the number of transmissions n, the interval indication information, and i, where i represents the current value of the first data. For the first transmission, i is greater than or equal to 1 and less than or equal to n.
  • Step S303 The second terminal device receives side control information from the first terminal device.
  • the second terminal device may receive the SCI sent by the first terminal device, and determine the number of transmissions n, the interval indication information, and the value of i according to the SCI. It can be seen that the SCI sent by the first terminal device can be used to indicate whether the first terminal device retransmits the first data. When n is equal to 1, it means that the first data is only transmitted once without retransmission; when n is greater than or equal to 2, it means that retransmission is performed.
  • Step S304 The first terminal device determines the first time-frequency resource used for the i-th transmission of the first data according to the number of transmissions n and the interval indication information.
  • the first time-frequency resource may include two parts in the time domain and the frequency domain. If only the time domain interval is indicated in the interval indication information, the first terminal device can determine the time domain start position of the first time-frequency resource according to the following formula 1, and then determine the first time-frequency resource according to the time domain start position :
  • the frequency domain start position or frequency domain resource of the first time-frequency resource may be the same as when the first data is sent for the first time.
  • the first terminal device can determine the frequency domain start position of the first time-frequency resource according to the following formula 2, and then determine the first time-frequency resource according to the frequency domain start position :
  • m is the frequency domain starting position when the first data is sent for the first time
  • SF frequency-gap is the frequency domain interval
  • N subCH is the width of the frequency domain resource pool.
  • the time domain start position or time domain resource of the first time-frequency resource may be the same as when the first data is sent for the first time.
  • the first terminal device can determine the time domain start position and the frequency domain start position of the first time-frequency resource according to the above formula 1 and formula 2, respectively, Furthermore, the first time-frequency resource is determined according to the time domain starting position and the frequency domain starting position.
  • the frequency domain interval and the time domain interval may have a certain association relationship.
  • the frequency domain interval satisfies the relationship shown in the following formula 3:
  • the K is an integer greater than or equal to 1. It can be seen from Formula 3 that the time domain interval can be an integer multiple of the frequency domain interval, or the frequency domain interval can also be an integer multiple of the time domain interval.
  • the first terminal device may also determine the frequency domain interval according to formula 3 according to the time domain interval indicated in the interval indication information, and then determine the frequency domain interval according to formula 2
  • the method determines the frequency domain start position of the first time-frequency resource, and then determines the first time-frequency resource according to the determined time domain start position and frequency domain start position.
  • the frequency domain interval may be indirectly indicated by the time domain interval in the interval indication information.
  • the first terminal device may also determine the time domain interval according to formula 3 according to the frequency domain interval indicated in the interval indication information, and then according to the method shown in formula 1, The time domain start position of the first time-frequency resource is determined, and the first time-frequency resource is determined according to the determined time domain start position and frequency domain start position.
  • the time domain interval may be indirectly indicated by the frequency domain interval in the interval indication information.
  • the first terminal device may also use other methods to determine the frequency domain start position of the first time-frequency resource. For example, the first terminal device may determine the frequency domain start position of the first time-frequency resource according to the following formula 4 and the configuration parameters of the related resources, and then determine the first time-frequency resource according to the frequency domain start position:
  • N subCH is the width of the frequency domain resource pool
  • L subCH is the frequency domain width occupied by the first data
  • n is the number of transmissions
  • N subCH , L subCH may be represented by the number of subchannels included, or the number of RBs included, for example, N subCH may be the maximum number of subchannels in the frequency domain resource pool.
  • the first terminal device can also use the method of determining the start position in the time domain shown in Formula 1 in combination with the method of determining the start position in the frequency domain shown in Formula 4 to finally determine the first time-frequency resource.
  • This application is not limited.
  • the first time-frequency resource mentioned in the embodiments of the present application may be scheduled by the network device, or may be determined by the first terminal device from a pre-configured resource pool or authorized resources, which is not specifically limited. .
  • Step S305 The first terminal device sends the first data to the second terminal device on the first time-frequency resource.
  • Step S306 The second terminal device determines the first time-frequency resource used for the i-th reception of the first data according to the number of transmissions n and the interval indication information.
  • the second terminal device may determine the first time-frequency resource in the same manner as the first terminal device, which is not repeated here.
  • Step S307 The second terminal device receives the first data sent by the first terminal device on the first time-frequency resource.
  • the first terminal device and the second terminal device can be based on the number of transmissions n indicated in the side control information and the time domain interval, frequency domain interval, or interval indicated in the interval indication information.
  • Time domain interval and frequency domain interval determine the time-frequency resource used when transmitting the first data for the i-th time.
  • the time-frequency resources used may be different, so that the time and frequency diversity gain can be fully utilized, and the reliability of data transmission can be effectively improved.
  • the number of transmissions n in the embodiment of the present application is greater than or equal to 3, which can support multiple retransmissions of the first data, and can be applied to more complex data transmission scenarios.
  • FIG. 4 different shading patterns correspond to different UEs.
  • the horizontal axis represents time and the vertical axis represents frequency.
  • the interval indication information indicates the time domain interval and frequency domain interval respectively.
  • the time domain interval SF time-gap of UE1, UE2, UE3 and UE4 is 1, 2, 3, 4, and the time domain interval of each UE Same as the frequency domain interval.
  • the time domain position of the first transmission is At time, the time domain position of the first retransmission (that is, the second transmission) is The time domain position of the second retransmission (that is, the third transmission) is The time domain position of the third retransmission (that is, the fourth transmission) is
  • FIG. 5 different shading patterns correspond to different UEs.
  • the horizontal axis represents time and the vertical axis represents frequency.
  • the values of SF time-gap of UE1, UE2, UE3 and UE4 are 2, 4, 6, and 8, respectively.
  • the time domain position of the first pass is At time, the time domain position of the first retransmission (that is, the second transmission) is The time domain position of the second retransmission (that is, the third transmission) is The time domain position of the third retransmission (that is, the fourth transmission) is
  • the horizontal axis represents time and the vertical axis represents frequency.
  • the interval indication information only indicates the time domain interval.
  • the UE uses the method shown in Formula 1 to determine the time domain starting position, and the method shown in Formula 4 to determine the frequency domain starting position.
  • L subCH can be the number of sub-channels actually occupied by PSCCH and PSSCH
  • the 6 frequency resource blocks indicate that the UE data has 6 transmission modes in the frequency domain, that is, there are 6 frequency domain resource positions to choose from.
  • the available 6 frequency resource blocks correspond to to time.
  • FIG. 6a is only an example of frequency resource blocks and does not need to correspond to different time units, and FIG. 6a is only for intuitively showing the 6 available frequency domain resource locations.
  • the method in formula 4 is used to determine the starting position of the retransmitted frequency sub-channel.
  • the time domain position of the first pass is At time, the time domain position of the first retransmission (that is, the second transmission) is The time domain position of the second retransmission (that is, the third transmission) The time domain position of the third retransmission (that is, the fourth transmission) is
  • FIG. 7 is a schematic structural diagram of a communication device provided in an embodiment of the application.
  • the communication device 700 includes a transceiver module 710 and a processing module 720.
  • the communication device can be used to implement the functions related to the first terminal device or the second terminal device in any of the foregoing method embodiments.
  • the communication device may be a terminal device, such as a handheld terminal device or a vehicle-mounted terminal device; the communication device may also be a chip included in the terminal device, or a device including the terminal device, such as various types of vehicles.
  • the transceiver module 710 is configured to send side-line control information to the second terminal device, and to the first terminal device on the determined first time-frequency resource. 2.
  • the operation of the terminal device to send the first data; the processing module 720 is configured to perform the operation of obtaining the transmission times and interval indication information, and determine the first time-frequency resource used for the i-th transmission of the first data according to the transmission times and interval indication information.
  • the transceiver module 710 is configured to receive side control information from the first terminal device, and receive the first terminal on the first time-frequency resource.
  • the operation of the first data sent by the device; the processing module 720 is configured to perform the operation of determining the first time-frequency resource used for the i-th reception of the first data according to the number of transmission n and the interval indication information.
  • the processing module 720 involved in the communication device may be implemented by a processor or processor-related circuit components, and the transceiver module 710 may be implemented by a transceiver or transceiver-related circuit components.
  • the operations and/or functions of each module in the communication device are used to implement the corresponding procedures of the methods shown in FIG. 3, FIG. 4, FIG. 5, FIG. 6a, and FIG. 6b. For the sake of brevity, details are not repeated here.
  • FIG. 8 is a schematic diagram of another structure of a communication device provided in an embodiment of this application.
  • the communication device may specifically be a terminal device. It is easy to understand and easy to illustrate.
  • the terminal device uses a mobile phone as an example.
  • the terminal device includes a processor, and may also include a memory. Of course, it may also include a radio frequency circuit, an antenna, and an input/output device.
  • the processor is mainly used to process the communication protocol and communication data, and to control the terminal device, execute the software program, and process the data of the software program.
  • the memory is mainly used to store software programs and data.
  • the radio frequency circuit is mainly used for the conversion of baseband signal and radio frequency signal and the processing of radio frequency signal.
  • the antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input and output devices.
  • the processor When data needs to be sent, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.
  • FIG. 8 only one memory and processor are shown in FIG. 8. In actual terminal equipment products, there may be one or more processors and one or more memories.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.
  • the antenna and radio frequency circuit with the transceiving function can be regarded as the transceiving unit of the terminal device
  • the processor with the processing function can be regarded as the processing unit of the terminal device.
  • the terminal device includes a transceiver unit 810 and a processing unit 820.
  • the transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver, and so on.
  • the processing unit may also be called a processor, a processing board, a processing module, a processing device, and so on.
  • the device for implementing the receiving function in the transceiver unit 810 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiver unit 810 can be regarded as the sending unit, that is, the transceiver unit 810 includes a receiving unit and a sending unit.
  • the transceiver unit may sometimes be called a transceiver, a transceiver, or a transceiver circuit.
  • the receiving unit may sometimes be called a receiver, receiver, or receiving circuit.
  • the transmitting unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.
  • transceiving unit 810 is configured to perform sending and receiving operations on the terminal device side in the foregoing method embodiment
  • processing unit 820 is configured to perform other operations on the terminal device in the foregoing method embodiment except for the transceiving operation.
  • An embodiment of the present application also provides a chip system, including: a processor, the processor is coupled with a memory, the memory is used to store a program or instruction, when the program or instruction is executed by the processor, the The chip system implements the method in any of the foregoing method embodiments.
  • processors in the chip system there may be one or more processors in the chip system.
  • the processor can be implemented by hardware or software.
  • the processor may be a logic circuit, an integrated circuit, or the like.
  • the processor may be a general-purpose processor, which is implemented by reading software codes stored in the memory.
  • the memory may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application.
  • the memory may be a non-transitory processor, such as a read-only memory ROM, which may be integrated with the processor on the same chip, or may be set on different chips.
  • the setting method of the processor is not specifically limited.
  • the chip system may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a system on chip (SoC). It can also be a central processor unit (CPU), a network processor (NP), a digital signal processing circuit (digital signal processor, DSP), or a microcontroller (microcontroller).
  • the controller unit, MCU may also be a programmable controller (programmable logic device, PLD) or other integrated chips.
  • each step in the foregoing method embodiments may be completed by an integrated logic circuit of hardware in a processor or instructions in the form of software.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the embodiment of the present application also provides a computer-readable storage medium, which stores computer-readable instructions, and when the computer reads and executes the computer-readable instructions, the computer is caused to execute any of the foregoing method embodiments Method in.
  • the embodiments of the present application also provide a computer program product.
  • the computer reads and executes the computer program product, the computer is caused to execute the method in any of the foregoing method embodiments.
  • An embodiment of the present application also provides a communication system, which includes a network device and at least one terminal device.
  • processors mentioned in the embodiments of this application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), or application specific integrated circuits ( application specific integrated circuit (ASIC), ready-made programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electronic Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory serial DRAM, SLDRAM
  • direct rambus RAM direct rambus RAM, DR RAM
  • the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component
  • the memory storage module
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

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